Add projects

backend/internal/thinking/strip.go

@@ -0,0 +1,74 @@
+// Package thinking provides unified thinking configuration processing.
+package thinking
+
+import (
+	"github.com/tidwall/gjson"
+	"github.com/tidwall/sjson"
+)
+
+// StripThinkingConfig removes thinking configuration fields from request body.
+//
+// This function is used when a model doesn't support thinking but the request
+// contains thinking configuration. The configuration is silently removed to
+// prevent upstream API errors.
+//
+// Parameters:
+//   - body: Original request body JSON
+//   - provider: Provider name (determines which fields to strip)
+//
+// Returns:
+//   - Modified request body JSON with thinking configuration removed
+//   - Original body is returned unchanged if:
+//   - body is empty or invalid JSON
+//   - provider is unknown
+//   - no thinking configuration found
+func StripThinkingConfig(body []byte, provider string) []byte {
+	if len(body) == 0 || !gjson.ValidBytes(body) {
+		return body
+	}
+
+	var paths []string
+	switch provider {
+	case "claude":
+		paths = []string{"thinking", "output_config.effort"}
+	case "gemini":
+		paths = []string{"generationConfig.thinkingConfig"}
+	case "antigravity":
+		paths = []string{"request.generationConfig.thinkingConfig"}
+	case "interactions":
+		paths = []string{
+			"generation_config.thinking_level",
+			"generation_config.thinkingLevel",
+			"generation_config.thinking_budget",
+			"generation_config.thinkingBudget",
+			"generation_config.thinking_summaries",
+			"generation_config.thinkingSummaries",
+			"generation_config.thinking_config",
+			"generation_config.thinkingConfig",
+		}
+	case "openai":
+		paths = []string{"reasoning_effort", "reasoning"}
+	case "kimi":
+		paths = []string{
+			"reasoning_effort",
+			"thinking",
+		}
+	case "codex", "xai":
+		paths = []string{"reasoning"}
+	default:
+		return body
+	}
+
+	result := body
+	for _, path := range paths {
+		result, _ = sjson.DeleteBytes(result, path)
+	}
+
+	// Avoid leaving an empty output_config object for Claude when effort was the only field.
+	if provider == "claude" {
+		if oc := gjson.GetBytes(result, "output_config"); oc.Exists() && oc.IsObject() && len(oc.Map()) == 0 {
+			result, _ = sjson.DeleteBytes(result, "output_config")
+		}
+	}
+	return result
+}